Improvement in boring-mills for metal



PATENTED AUG. 5, 1862 WFSELLERS."

BORING MILL FOR METAL.

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hy m

, ii) an whom it may concern WILLIAM s'ELILn'Rs, on rHI nAD LPH A;PEN NsYLv-AN-IA.

lMPROVEMENT is: BO RlNG-Ml LLS FOR METAL.

Specification formingpartnf Letters Patent No. 36,112, daicd August 5, 1862.

Be it known that 11, WILLIAM SELLERS, of

the city of Philadelphiaandf State off-Pennsylvania, have invented certain new and useful Improvements in Boring-Mills for Meta-l;

and I do hereby declare 'the following to be afull anduexact description of the same,refc rence being had to the accompanying draw in g, and to the figures and letters of reference marked thereomf 1 r My inventionrelates to the class of boringmills for metal in which the piece to be bored revolves with a circular table or face-plate upon av vertical axis, and ,in which a vertical "moveme'ntof the boring-bar in the line'of said file geeds' the cutter through the work to be In the ordinary construction of. boring-mills of this class the boring-baris attached to a vertical slide suspended above the center of table and carried either by an arched irame the bases of which are attached at opposite sides to the bed of, the machine, or by a horizontal cross head attached to uprights also fastened to opposite sides of the bed; or the boring-bar and its slide are sometimes carried upon a stontpseml-arched frameattached to one side of the ten-mama top inclining to-v ward the" center; 05 rotation and embracing the' slide improper position to bring the axis ofbiihe boring-bar inline' itl the axis of the p a e.

- It will at once be-anparntthat'with any of the above constructions of boringmachines the diameter of the piece that will s'wing m the machine isiimited by the frame-work at tached to the bed and extending above the table to carry the boring-bar, and it will also 1 be seen that the construction of a machine of the ,above description to swing larger diams,

ctersinvolves great weightof thevarious parts to, give the stability required for the ,proper action of the cutting-bar, although the:'char-' actor of the work to be donc'an'd the power consumed to do it may be comparatively light. Inorderto diminish the weight of material fand cost of the above-described machines,

some boring-mills have becn made in which the boring-bar is held vbya spindle sliding in and supported by the spindle which carries the face-plate upon which the work to be bored is bolted. The boring-spindle, having only motion in the direct-ion of its axis, and being held laterally by a revolving support, is peculiarlyliable to wear, and as in this arrangement no provision has been made for the es-- cape of the'chips from the cutter, and the sliding spindle carrying the boring bar must necessarily be surrounded by them, no nicety J of fit, is admissible or can beimaintained, and the work performed by such a tool is neces sarily of inferior quality as'well as quantity.

Now, the main object of my invention is to construct a machine that will combine almost.

unlimited capacity for work of auy'ordinary character vwith perfect stifi'nc'ss and with no morcthan usual liability to the wear of working parts. v To this end I dispense with all the frainc work above the table for carrying the boringi bar, and provide in the interior oi the bed of the machine a strong vertical slide working 7 in suitable bearings cast in the bed. This slide is, on its top, arranged to receive the cutter-bar, and provided with a rack, by means of which the vertical movement required for the action of the boring-bar is given, as hereinafter fully described. The rotatingmotionis given to thetable by "means of a bevel-pinion upon A.

a v horizontal shaft, gearing-with teeth on the under side of the table. Alon g bearing, is rovided in the bed for'th'c pinion-shaft, at the.

upper half of this. pulley being the only part .ofthe machine that projects abovethe face of thetable'. 'Bhdpulleyis, however, so far romovcd from the center of the table as to form noimpediment to the swinging of, work of considcrablejdiameter, and when pieces of uncommonlylarge diameters are required to be; bored it is only necessary to provide an extcng .s'ion of the pinion-shaft with an outside bear ing and to remove thedriving-pnlley as far from the center of the machine as'i's needed for the purpose. I

It-will; be evident that with the above as rangement of the slide and boring-bar a central spindle with a step-bearing for the table is inadmissible. I therefore provide thetable on its under 1 side with an annular projection of considerable diameter and depth, which is fitted into a deep circular channel of correoutside end of which "is the driving-pulley, the a a some sponding shape and diameter in the top of the pose, hereinafter fully described, forms another feature of my invention.

In order that my said invention and the manner in which the same is carried into practice may be fully understood, I will now proceed more particularly to describe the same, reference being had to the accompanyin gdrawing, making part of this specification, in which the'same letters of reference allude to similar parts throughout the several views, and in whichi Figure 1 is a sectional side elevation of my improved boring-mill. Fig. 2' is a sectional elevation at right angles to Fig. 1. Fig. 3 is a plan of the machine; and Figs. 4 and 5 are detached views of the device for taking up in the circular groove in the top of the A is the bed of the machine. It is of a hollow cylindrical form, spread into a wide flange, a, on the bottom, and is, at the top, provided with a heavy rim, b swelled outward from the cylindrical body or the bed. The top side of this rim or swell b is hollowed out to form a deep circular channel with slightly-beveled sides. 1

The table 13 is, upon its lower side, provided with two circular projections, 0 and D, he inner one of which corresponds in diameter and thicknesswith the channel inthe top of .the bed, and is accurately fitted to the sides of the said channel in which the table is thus guided in its rotating motion. This motion 1s given to the table by means of a bevel-pinion, E, gearing with teeth of corresponding bevel outhe bottom of the outer circular projection, D, of the table. This pinion E is at- ;tached to a. shaft, F, which has a long bcarin g a sleeve, G, cast with the bed, to the bodyof which it is connected by means of a web, c,

and rib c.

3 The shaft F has upon its outer end a conical driving-pulley, H, for'adju'sting the speed I of the machine to suit difl'crent sizes of out 'ters. i

' I is the vertical slide in the interior of the bed A. It has beveled sides 0 0, which are accurately fitted to vertical grooves of cone spoh'ding shape in the bed, the slide being confined between thesaid'grooves in'sfich a mannor as to] )ermit a vertical movement only, without si eward play in any direction. The boringbar K is attached to the top of .slide I in the manner best seen at Fig. 2. It

3 is screwed into the slide against a hexagonal collar, 9, the lower end of the portion entering the slide being provided with a right-hand screw-thread, so that thedireetion of the cut and the torsional strain upon the bar from the cut teudsto screw it tighter into its socket.

In the annexed drawing, the slide I is represented as being actuated by means of a handwheel, L, and pinion M- upon a, shaft, N the pinion gearing with a rack, h, in the slide. It will, however, be understood by any good'mechanic that a combination of gearing may be substituted by means of which a self-acting fiaedigg movement of the slide ca'n be prouce The arrangement of the parts for taking up any wear between the surfaces of the beveled circular projection G of the table and the sides of the channel in the top of the bed is as follows: The rim (J is, on its lower side, hollowed out to form a deep narrow gutter with parallel sides, into which is fitted a T-shaped ring, P, in the manner seen at Figs. 1 and 2. The upper narrow face, 01, of ring I is so shaped asto present a series of inclined planes, all running in the same direction, and of whichtherc are three represented in the drawing. '(See Fig. 4.)

' The bottom surface, e, of the gutter- O is shaped to coincide with the inclined planes on the ring. P. This ring being placed in its position in the top of the bed, with the table B resting upon the inclined planes d d of the ring P, it will be evident that a variation in the relative position of the table B and ring I aroundtheir axis will, by the action of the inclined planes d and e, elevate or depress the the table, according to the direction in which either is moved, and' thus provide an accurate adjustment of the sides of C to the beveled sides of the channel in the top of the bed. 'One of the inclined planes-d on the ring- P has teeth out upon it, into which gears a pinion, k, on a small shaft, 1-. This has its bearing in the tarble, B, and is at its outer-end provided with a squared projection for the application of a wrench. to actuate the pinion whenever it is required to adjust the bearing-surfaces of O in the circular channel of the bed.

. .misa setsscrew, which, when tightened against the shaft 1, serves to lock the pinion k and rin g P, after the latter has been properly adjusted.

Thedepth-of the gutter in C is, in relation to the whole height of the ring-1?, so proportioned as to leave some space between the f lower surface of O and the bottom flange of rin g P, so as to prevent any contactof the lower surfaces from interfering with the vertical ad-" justment of the table. I

Having thus described the nature of my invention, I wish to be understood as not'desiring to confine myself to the described construction and arrangement of the various parts in every minutia, as the same may be modified without thereby impairing my invention; but What I claim, and desire to secure by Let.- tcrs Patent, is

l. The described construction of a boring hill for men, i whim the boring-bai'is am. the table-3,6: a ring, P, or its equivalent rbed and held in position lateraliy by a vertiwhen arranged; and operating substantially i1 0811' slide placed beneath the table or face-' the manner and for the purpose set forth.

late of'the machine, the whole being cou- WM. SELLERS.

Witnesses:

acted and operating substantially in the manner and. for the purpose specified. Jos; B. ROUGH OLIVER HOUGH.

2. The eanployment, in combination with 

